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1992
Clifford, H. F., & Casey R. J. (1992).  Differences between operators in collecting quantitative samples of stream macroinvertebrates. 7(3), 271-276.
1991
Clifford, H. F. (1991).  Aquatic invertebrates of Alberta.
1987
Clifford, H. F., & Hamilton H. R. (1987).  Volume of material ingested by mayfly nymphs of various sizes from some Canadian streams. 4, 259-261.
1984
Ciborowski, J. J. H., & Clifford H. F. (1984).  Short-term colonization patterns of lotic macroinvertebrates. 41(11), 1626-1633.
1983
Hamilton, H. R., & Clifford H. F. (1983).  The seasonal food habits of mayfly (Ephemeroptera) nymphs from three Alberta, Canada, streams, with special reference to absolute volume and size particles ingested. 65, 197-234.
1982
Boerger, H., & Clifford H. F. (1982).  Density and microdistribution of chironomid larvae in an Alberta brown-water stream. 60, 913-920.
1979
Clifford, H. F., & Barton D. R. (1979).  Observations on the biology of Ametropus neavei McDunnough (Ephemeroptera: Ametropodidae) from a large river in northern Alberta. 111, 855-858.
1976
Clifford, H. F., & Bergstrom G. (1976).  The blind aquatic isopod Salmasellus from a cave spring of the Rocky Mountain eastern slopes, with a comment on a Wisconsinan refugium. 54(11), 2028-2032.
Clifford, H. F. (1976).  Observations on the life cycle of Siphloplecton basale (Walker). 111, 855-858.
1975
Boerger, H., & Clifford H. F. (1975).  Emergence of mayflies (Ephemeroptera) from a northern brown-water stream of Alberta, Canada. 19, 3022-3028.
1974
Boerger, H., & Clifford H. F. (1974).  Fecundity of mayflies (Ephemeroptera) with special reference to mayflies of a brownwater stream of Alberta, Canada. 106, 1111-1119.
Hayden, W., & Clifford H. F. (1974).  Seasonal movements of the mayfly Leptoplebia cupida (Say) in a brown-water stream of Alberta, Canada. 91, 90-102.
1972
Zelt, K. A., & Clifford H. F. (1972).  Assessment of two mesh sizes for interpreting life cycles, standing crop and percentage composition of stream insects. 2, 259-269.
Clifford, H. F. (1972).  Drift of invertebrates in an intermittent stream draining marshy terrain of west-central Alberta. 50(7), 985-991.
1966
Clifford, H. F. (1966).  The ecology of invertebrates in an intermittent stream. 7, 57-98.

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